docs: def filter_sequences(self, seq_type):
          """Return a DictList of only specified types in the sequences attribute.
  
          Args:
              seq_type (SeqProp): Object type
  
          Returns:
              DictList: A filtered DictList of specified object type only
  
          """
          return DictList(x for x in self.sequences if isinstance(x, seq_type))